Identify the incorrect statement among the following (1) Ozone reacts with $\mathrm{SO}_{2}$ to give $\mathrm{SO}_{3}$ (2) Silicon reacts with $\mathrm{NaOH}_{(\mathrm{aq})}$ in the presence of air to give $\mathrm{Na}_{2}\mathrm{SiO}_{3}$ and $\mathrm{H}_{2}\mathrm{O}$ (3) $\mathrm{Cl}_{2}$ reacts with excess of $\mathrm{NH}_{3}$ to give $\mathrm{N}_{2}$ and HCl (4) $\mathrm{Br}_{2}$ reacts with hot and strong NaOH solution to give $\mathrm{NaBr}, \mathrm{NaBrO}_{4}$ and $\mathrm{H}_{2}\mathrm{O}$

(D) $\mathrm{Br}_{2}$ reacts with hot and strong NaOH solution to give $\mathrm{NaBr}, \mathrm{NaBrO}_{4}$ and $\mathrm{H}_{2}\mathrm{O}$

(A) Ozone reacts with $\mathrm{SO}_{2}$ to give $\mathrm{SO}_{3}$

(B) Silicon reacts with $\mathrm{NaOH}_{(\mathrm{aq})}$ in the presence of air to give $\mathrm{Na}_{2}\mathrm{SiO}_{3}$ and $\mathrm{H}_{2}\mathrm{O}$

(C) $\mathrm{Cl}_{2}$ reacts with excess of $\mathrm{NH}_{3}$ to give $\mathrm{N}_{2}$ and HCl

JEE Main · 2007 · 29 Apr 2007 · Offline · p-Block Elements

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Identify the incorrect statement among the following
(1) Ozone reacts with

SO_{2}

to give

SO_{3}

(2) Silicon reacts with

NaOH_{(aq)}

in the presence of air to give

Na_{2} SiO_{3}

and

H_{2} O

(3)

Cl_{2}

reacts with excess of

NH_{3}

to give

N_{2}

and HCl
(4)

Br_{2}

reacts with hot and strong NaOH solution to give

NaBr, NaBrO_{4}

and

H_{2} O

(A)Ozone reacts with $SO_{2}$ to give $SO_{3}$
(B)Silicon reacts with $NaOH_{(aq)}$ in the presence of air to give $Na_{2} SiO_{3}$ and $H_{2} O$
(C) $Cl_{2}$ reacts with excess of $NH_{3}$ to give $N_{2}$ and HCl
(D) $Br_{2}$ reacts with hot and strong NaOH solution to give $NaBr, NaBrO_{4}$ and $H_{2} O$ ✓ Correct

Answer: (D)

Solution

Checking each reaction, bromine with hot concentrated sodium hydroxide does not give a perbromate. It disproportionates instead to bromide and bromate,

3 B r_{2} + 6 NaOH \to 5 NaBr + NaBr O_{3} + 3 H_{2} O

. The statement naming

NaBr O_{4}

as a product is thus the incorrect one.

JEE Main · 2007 · 29 Apr 2007 · Offline · Single correct option

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JEE Main · 2007 · 29 Apr 2007 · Offline · p-Block Elements

Solution

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